Each mission starts off by having you assemble your troops. They start you off with basic units, such as tanks and flying bug-looking offensive machines. The further you go, the more you'll have in your repertoire. And the more cash you earn by destroying emplacements, the more you'll be able to spend, either on reinforcements or upgrades for your existing units.
So you buy your troops and start down your path. At any point during the mission, you can hit (Triangle) to zoom out to a tactical map displaying route options, as well as the estimated time it will take for the convoy to reach each junction. Emplacements stand out in red, which gives you a really good idea of which areas you should avoid. Or perhaps you'll create a loop and destroy everything in a second pass. The choice is yours, but you have limited resources with which to carry out your mission.
Speaking of resources, you have a handful of special abilities that go a very long way in assisting your convoy. These include a healing beacon that repairs all friendly units within a specific circle area, a smokescreen that renders you virtually invisible to your enemies, a decoy that draws their fire away from you, and a good, old-fashioned scorched earth airstrike. These abilities are great fun to use, and even more so when they result in a victory that you otherwise would not have even come close to earning. These abilities are consumable, but they are often dropped as care packages the further you get into each level.
You are not the only unit with abilities, however, and you must learn to adapt if the enemies use their own abilities. For example, if a hacker places a field near your destination, you must take care not to enter the field with your units. If you do, they will attack you. You must also try to keep your ability fields away from energizers, which absorb the energy and convert it into a blast of healing energy for enemy units.
Anomaly: Warzone Earth comes highly recommended due to its excellent concept, great implementation, and engaging gameplay. It's a fresh twist on an arguably tired genre, and it's so fresh that it feels like its own beast. Long story short, if you're looking for something smart and innovative at a great value, you'd be hard-pressed to find a better example than Anomaly: Warzone Earth.